body{
    width: 100%;
    height: auto;
}
section{
    width: 100%;
    height: 40em;
}
#xmlcode{
    position: relative;
    top: 3em;
    resize: none;
}
.codexml{
    width: 80em;
    height: 80%;
    margin: 0 auto;
}
.btn{
    position: relative;
    top: 1em;
}